CN100394684C - Structure and method for protecting a converter device - Google Patents
Structure and method for protecting a converter device Download PDFInfo
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- CN100394684C CN100394684C CNB2004800003216A CN200480000321A CN100394684C CN 100394684 C CN100394684 C CN 100394684C CN B2004800003216 A CNB2004800003216 A CN B2004800003216A CN 200480000321 A CN200480000321 A CN 200480000321A CN 100394684 C CN100394684 C CN 100394684C
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- 238000000034 method Methods 0.000 title claims description 19
- 230000001681 protective effect Effects 0.000 claims description 28
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
A protection arrangement for a converter device (INU) comprising a plurality of controllable switches (V1 to V6), the protection arrangement comprising a protection circuit (2) coupled to an ac voltage side of the converter device (INU), the protection circuit comprising at least one protection switch (V11) configured to short-circuit the ac voltage side of the converter device (INU), wherein, in a predetermined fault situation, the protection arrangement is configured to close the protection switch (V11) and thereby short-circuit the ac voltage side of the converter device (INU). After the fault condition is cleared, the protection arrangement is configured to short-circuit the ac voltage side of the converter means (INU) via the controllable switches (V2, V4, V6) to improve commutation of the protection switch (V11).
Description
Technical field
The present invention relates to protect converter apparatus in the motor-driven not to be subjected to the influence of overvoltage and overcurrent.
Background technology
Transducer is used in various generators and the motor driven.A kind of this motor-driven that comprises transducer is two feedback slip ring (slip-ring) electric generator structures, and its rotor circuit comprises two transducers that have dc voltage intermediate circuit betwixt.A current potential in these transducers is between dc voltage intermediate circuit and rotor, and another transducer current potential is between dc voltage intermediate circuit and the electrical network that will power.
This two feedback slip ring electric generator structures with specific rated speed are configured to work in the specific range of speeds usually, have upper and lower bound according to this range of speeds of transformer ratio of selected stator and rotor.Rated speed is that the range of speeds of two feedback slip ring electric generator structures of 15001/ minute for example can be 1000 to 20001/ minutes.When generator with than the rotation of the little rotating speed of rated speed the time, some power by the stator feedback is fed back to rotor via the slip ring of transducer and generator.Similarly, when generator with than the rotation of the big rotating speed of rated speed the time, power is fed back to network by generator powered via the slip ring of rotor and transducer from rotor.
When the range of speeds of electric generator structure meets above-mentioned value, promptly, this structural arrangements is when working in the range of speeds, and wherein this scope departs from 1/3rd of generator rated speed, and the size of two transducers of this of rotor circuit can only be 1/3rd of a generator power.Save investment cost like this, but when designing the protection of electric generator structure, had to consider the power handling capability that transducer is relatively low.
In the network failure process, the voltage of dc voltage intermediate circuit owing to the generating transformer ratio may raise the enough high transducer that causes damaging in the rotor circuit.Be well known that, by the transducer in the protective circuit protection rotor circuit that comprises thyristor, thereby make under failure condition via this thyristor make rotor circuit between rotor and transducer by short circuit.Be accompanied by the triggering of thyristor, the switch of transducer is opened and makes the electric current of transducer finish.This makes it possible to protect the transducer of rotor circuit not to be subjected to superpotential the influence, and can protect the zero diode (zero diode) of transducer not to be subjected to the influence of overcurrent.
Use the above-mentioned protective circuit that realizes by thyristor to have the various problems that depend on motor-driven type and performance, this motor-driven transducer is protected by this protective circuit.With regard to all situations, basic problem is the commutation of protection thyristor.For example, in the situation of above-mentioned two feedback slip ring electric generator structures, existing problem is that fault can not be restarted the operate as normal of electric generator structure afterwards, unless the generator no current is passed through.The prerequisite that makes generator be in no current state depends on that the protection thyristor can not commutate reliably.
Summary of the invention
An object of the present invention is to provide a kind of protection structure that is used for converter apparatus, so that can address the above problem.This purpose of the present invention is to realize that by a kind of protection structure that is used for converter apparatus its feature is disclosed in the independent claims.The preferred embodiments of the present invention openly in the dependent claims.
Basic thought of the present invention is by the gate-controlled switch short circuit that the belongs to converter apparatus commutation that the alternating voltage side of parallel operation device improves protection switch in the protective circuit of converter apparatus of turning round.
An advantage of protection structure of the present invention is to continue the operate as normal of electric machine structure after failure condition basically immediately.
Further aim of the present invention provides the method that a kind of use is used for the protection structure of converter apparatus.
Description of drawings
Also describe the present invention with reference to the accompanying drawings in detail in conjunction with preferred embodiment now, in the accompanying drawing:
Fig. 1 shows the protection structure that is used for converter apparatus according to the embodiment of the invention;
Fig. 2 shows the wind drive of the protection structure that comprises Fig. 1; With
Fig. 3 to 8 shows electric current and the voltage under the failure condition in the wind drive of Fig. 2.
Embodiment
Fig. 1 shows the protection structure according to the rotor circuit that is used for two feedback slip ring generators of the embodiment of the invention, and this protection structure comprises rotor-side converter means INU, is coupled to du/dt filter 8 and the protective circuit 2 of phase L1 to L 3.For brevity, the element that is configured in order to measurement electric weight, processing measurement result and control switch is not shown among the figure.
Rotor-side converter means INU has DC voltage side and alternating voltage side.DC voltage side is electrically coupled to dc voltage intermediate circuit 3.The alternating voltage side is electrically coupled to the rotor of generator.Rotor-side converter means INU comprises that the three-phase voltage that is used for rotor carries out rectification and is used for it is fed to the device of dc voltage intermediate circuit 3, and is used for the device that direct voltage to dc voltage intermediate circuit 3 carries out inversion and is used for it is fed to rotor.Like this, rotor-side converter means INU is configured to that power both had been fed to rotor and also is fed to network by generator powered.
Among Fig. 1, protective circuit 2 is coupling between rotor-side converter means INU and the du/dt filter 8.Also du/dt filter 8 can be coupled to the output of the alternating voltage side of rotor-side converter means INU, between converter apparatus INU and protective circuit, to produce du/dt filtering.Similarly, the du/dt filter can be divided into two parts, and protective circuit 2 is coupling between these two parts.Sometimes, also can in structure, dispense this du/dt filter 8 fully.
Rotor-side converter means INU comprises six gate-controlled switch V1 to V6, and they are configured as modulates the alternating voltage that obtains from the direct voltage of dc voltage intermediate circuit 3.Switch V1 for example can be transistor or other corresponding semiconductor switch to V6.
Rotor-side converter means INU further comprises six zero diode D1 to D6, each all with corresponding switch V1 to the V6 parallel coupled.Coupling zero diode D1 makes them carry out rectification to the electric current that flows to dc voltage intermediate circuit 3 from rotor to D6 like this.In one embodiment, zero diode D1 is integrated into corresponding controllable switch V1 in V6 to D6.For example, IGBT just comprises this structure.
The protective circuit 2 of structure shown in Figure 1 comprises the three-phase commutation bridge of being realized by diode.Protection switch V11 and auxiliary commutation means 10 are coupled in series between the positive pole and negative pole of rectifier bridge, and wherein this auxiliary commutation means 10 is configured as in order to improve the commutation of protection switch V11.Auxiliary commutation means 10 comprises a plurality of diode V12 of series coupled to V (n), and with the capacitor C of these a plurality of diode parallel coupled.Protection switch V11 for example can be a thyristor.
Fig. 2 shows the wind drive that comprises protection structure shown in Figure 1.Wind drive shown in Figure 2 is used the asynchronous generator 1 that is equipped with slip ring.Except protective circuit 2, rotor-side converter INU and dc voltage intermediate circuit 3, the rotor circuit of asynchronous generator 1 also comprises network commutator ISU.Rotor circuit is connected on the electrical network that will power via switch 4, power transformer 5 and the medium-voltage switchgear 6 of rotor circuit.When main switch 7 is positioned on such point, the stator circuit of asynchronous generator 1 is connected on the electrical network that will power via this main switch 7, between the point of wherein above-mentioned this current potential before the stator of generator 1 and stator and rotor circuit can combine in power transformer 5.
When the protection structure detection of rotor circuit during to the network failure that conforms to a predetermined condition, the protection structure is opened switch V1 to V6, and controls protection switch V11 closure.Network failure for example can be defined as such a case, and wherein the voltage of rotor current or dc voltage intermediate circuit has surpassed predetermined limit value.The closed protection switch V11 short circuit electronic circuit of turning round, like this, the short circuit current that comes from rotor flows through the protection switch V11 of protective circuit 2.
Under the situation of structure shown in Figure 2, the network failure that conforms to a predetermined condition for example can be the voltage die of the network that will power.Do not having under the situation of safeguard measure, the voltage die of the network that power can cause producing the uprushing of danger of the voltage of rotor and stator current and dc voltage intermediate circuit 3.
When the protection structure detection when network failure has finished; with regard to Closing Switch V2, V4 and V6; make the short circuit current that comes from rotor transfer to rotor-side converter means, make short circuit current begin to flow through the negative busbar Udc-of dc voltage intermediate circuit 3 from protective circuit 2.Replacedly, by Closing Switch V1, V3 and V5, the short circuit current that comes from rotor can be transferred to rotor-side converter means from protective circuit 2, and like this, short circuit current begins to flow through the positive bus-bar Udc+ of dc voltage intermediate circuit 3.In other words, after failure condition finished, the protection structure was configured to by using gate-controlled switch V1 at least a portion short circuit of V6 commutation that the alternating voltage side of parallel operation device INU improves protection switch V11 of turning round.The short circuit current that comes from rotor depends on that to the transfer of rotor-side converter means diode bridge, protection switch V11 and diode V12 in the protective circuit 2 are higher than the threshold voltage of element among the rotor-side converter means INU that short circuit current flows through to the combined threshold value voltage of V (n).For protection switch V11 can be commutated, the short circuit current that hope will come from rotor is transferred to the position away from protective circuit 2.
Help protection switch V11 to commutate with diode V12 to the capacitor C of V (n) parallel coupled and the protective circuit 2 of when short circuit current flows in protective circuit 2, charging.
When short circuit current is transferred to rotor-side converter means from protective circuit 2; be that short circuit current has begun flow through closed switch V2, V4 and V6 (perhaps V1, V3 and V5); and when protection switch V11 has finished commutation, can restart to modulate to V6 by utilizing switch V1.
Can also use the mode except shown in Fig. 1 to realize auxiliary commutation means 10.For example, can increase one or more resistors of connecting with protection switch V11.Diode V12 can be replaced by other element with appropriate threshold voltage to V (n).Auxiliary commutation means can be integrated among the protection switch V11 at least in part, and protection switch V11 can be configured as according to control signal and turn-offs.Therefore, protection switch V11 for example can be IGBT or GTO.Protective circuit 2 can comprise the protection switch V11 of specific phase (phase-specific), and protective circuit 2 does not need rectifier bridge like this.Auxiliary commutation means 10 may further include the forced commutation circuit with protection switch V11 parallel coupled.This forced commutation circuit is known in the art, so their structure will be discussed herein.
Under the situation of structure shown in Figure 1; and when working condition is that the fault situation has finished and in order to shift the short circuit current that comes from rotor and to make these switch closures to flow through switch V2, V4 and V6; for example, can flow through the electric current of switch V2, V4 and V6 and the rate of change of these electric currents carries out the commutation of protection switch V11 by measurement.The details of the switch operation of protection switch V11 as the duration of switch operation, depends on the type of protection switch V11, therefore it will be taken into account when selecting the Control Parameter of protection structure.
Commutated and the three-phase side of transducer INU may have problem by gate-controlled switch V2, V4 and V6 are begun rotor-side converter INU under the situation of short circuit normal running from the protection switch V11 of protective circuit 2.If continue normally to modulate, then the rotor of generator 1 and stator current may remain on high level, and are difficult to control for a long time.Under the situation that does not have further action, also abnormal operating state may appear.
Above-mentioned problem when control rotor and stator current can solve by opening rotor circuit, thereafter, from the network that will power see generator 1 just look like it be a transformer of opening or choke.Thereby the electric current of generator unit stator drops to basically and the corresponding level of its magnetizing current fast.Then, can begin the normal running of rotor circuit safely.
In structure shown in Figure 2, the electric current that can measure and utilize rotor circuit is to determine to begin to V6 by the switch V1 of rotor-side converter INU the moment of normal modulation.For example exist under the situation of voltage die at the network that will power; wherein this voltage die causes protection switch V11 closure; when gate-controlled switch V1 after protection switch V11 commutation when V6 is opened, can estimate to begin the possibility of normal modulation by the electric current of measurement rotor circuit.For example can in rotor-side converter INU, carry out this measurement.When in rotor circuit, no longer detecting the electric current burst pulse, just can begin normal modulation safely.
For example can open rotor circuit to V6 by the gate-controlled switch V1 that opens transducer INU.If structure shown in Figure 2 provides other switch between the rotor of generator 1 and rotor-side converter INU, then can be by this other switch opens rotor circuit.
The stator circuit of the generator 1 of the wind drive shown in Fig. 2 can keep being coupled on the network that will power in whole network failure (as voltage die) process.If the gate-controlled switch V1 by opening rotor-side converter INU carries out the opening action of the above-mentioned rotor circuit of carrying out for mild rotor and stator current to V6, then in whole network failure process, network commutator ISU is coupled on stator circuit and the network that will power, so that network commutator ISU keeps the voltage of dc voltage intermediate circuit 3 in the network failure process.
Be illustrated in the network that will power may out of order information the time when protection structure shown in Figure 1 receives, circuit 2 short circuits that wherein need protection this moment can at first be opened switch V1 to V6, and before closed protection switch V11 the one preset time cycle of wait.In this time cycle process,, then continue operation with normal mode if receive expression electric current and/or the information of voltage that fault that switch V11 is closed finished that need protection.
In the superincumbent description, gate-controlled switch V1 means to opening of V6 and its objective is and will utilize control to open these switches.Like this, according to the type of gate-controlled switch V1 to V6, they for example need not further be triggered, and if gate-controlled switch be configured as according to the control of the electric current that passes through and cut off voluntarily, then this opening just comprises and will open impulse feeding to switch.For example, the gate-controlled switch V1 that big electric current flows through rotor-side converter INU under failure condition is under the situation of V6, and above-mentioned control procedure does not need successfully to finish to flow through the electric current of switch V1 to V6.Like this, utilize the content of using in the superincumbent description, open switch V1 and needn't cut off electric current, but protection switch V11 also needs to be closed by them to V6.Like this, this situation just has been opened to mechanical switch but the situation of electric arc wherein to occur similar.
Be opened to V6 even work as switch V1, the simulation of electric machine structure is also continuing.In electric generator structure shown in Figure 2, voltage, the position of axle and the rotating speed of generator of the network that control device grasping for example stator and rotor current all the time, will power.It is very favourable continuing simulation when estimating the moment safely of continuing modulation.
Fig. 3 to 8 shows voltage when the network that will power and descends when using the protection structure of converter apparatus in the above described manner 65% the time electric current and voltage condition in the wind drive shown in Fig. 2.In-0.04000 second to 0.28764 second time cycle process with the interval measurement electric current of 20 microseconds and the value of voltage.Fig. 3 to 8 shows following quantity:
Fig. 3 Uuv, the phase voltage U-V of rot=rotor-side converter (INU)
Fig. 4 Iu, the U phase current of rot=rotor-side converter (INU)
Fig. 5 Udc, the voltage of rectifier bridge in the crowbar=protective circuit 2
Fig. 6 Idc, the electric current of protection switch V11 in the crowbar=protective circuit 2
Fig. 7 Uuw, the phase voltage U-W of the network that grid=will power
Fig. 8 Iu, the U phase current of the network that grid=will power
Although shown herein example relates to the protection of the transducer of two feedback slip ring generator rotor circuit, protection structure of the present invention also can be used to protect the transducer of other type motor structure.Protection structure of the present invention is suitable for protecting asynchronous and transducer synchronous machine drives, and this driving can be generator drive or motor driven.It should be obvious to a one skilled in the art that and to realize basic thought of the present invention with many different modes.Therefore, the present invention and embodiment are not limited to above-mentioned example, but can change within the scope of the claims.
Claims (14)
1. protection structure that is used for converter apparatus INU; this converter apparatus has the DC voltage side that is coupled to dc voltage intermediate circuit (3); with the alternating voltage side; and this converter apparatus INU comprises that the direct voltage that is used for dc voltage intermediate circuit (3) carries out inversion and is used for it is fed to the DC-to-AC converter of alternating voltage side; this DC-to-AC converter comprises a plurality of gate-controlled switches (V1 is to V6); this protection structure comprises the protective circuit (2) of the alternating voltage side that is coupled to converter apparatus INU; this protective circuit comprises that at least one is configured in order to the turn round protection switch (V11) of alternating voltage side of parallel operation device INU of short circuit; wherein under predetermined failure condition; this protection structural arrangements becomes closed protection switch (V11); and the therefore short circuit alternating voltage side of turning round parallel operation device INU; it is characterized in that; after failure condition finished, the protection structural arrangements became by at least a portion short circuit of using gate-controlled switch (V1 is to V6) to turn round the alternating voltage side of parallel operation device INU with the commutation of raising protection switch (V11).
2. protection structure as claimed in claim 1; it is characterized in that; under predetermined failure condition; this structural arrangements becomes at closed protection switch (V11) before; open a plurality of gate-controlled switches (V1 is to V6) of DC-to-AC converter among the converter apparatus INU, and keep gate-controlled switch (V1 is to V6) to open till failure condition finishes.
3. protection structure as claimed in claim 1 or 2 is characterized in that, after protection switch (V11) commutation, this structural arrangements becomes to open the gate-controlled switch (V1 is to V6) of converter apparatus INU, and keeps them to open till can beginning modulation safely.
4. protection structure as claimed in claim 1 or 2 is characterized in that, protective circuit (2) comprises auxiliary commutation means (10), and this auxiliary commutation means (10) is configured in order to improve the commutation of protection switch (V11).
5. protection structure as claimed in claim 4 is characterized in that, auxiliary commutation means (10) comprise with a plurality of diodes (V12, V (n)) of protection switch (V11) series coupled and with the capacitor (C) of these a plurality of diode parallel coupled.
6. protection structure as claimed in claim 1 or 2 is characterized in that, converter apparatus INU comprises that further the alternating voltage that is used for the alternating voltage side carries out rectification and it is fed to the device (D1 is to D6) of dc voltage intermediate circuit (3).
7. protection structure as claimed in claim 1 or 2; it is characterized in that; when failure condition finishes and protection switch (V11) when commutating; this structural arrangements becomes to turn back to normal operating conditions, wherein among the control transformation apparatus INU a plurality of gate-controlled switches (V1 is to V6) of DC-to-AC converter so that the direct voltage of dc voltage intermediate circuit (3) is carried out inversion.
8. protection structure as claimed in claim 1 or 2 is characterized in that, this structural arrangements becomes the rotor circuit of protection two feedback slip ring generator (1).
9. a use is used for the method for the protection structure of converter apparatus; this converter apparatus has the DC voltage side that is coupled to dc voltage intermediate circuit (3); with the alternating voltage side; and this converter apparatus INU comprises that the direct voltage that is used for dc voltage intermediate circuit (3) carries out inversion and is used for it is fed to the DC-to-AC converter of alternating voltage side; this DC-to-AC converter comprises a plurality of gate-controlled switches (V1 is to V6); this protection structure comprises the protective circuit (2) of the alternating voltage side that is coupled to converter apparatus INU; this protective circuit comprises that at least one is configured in order to the turn round protection switch (V11) of alternating voltage side of parallel operation device INU of short circuit; this method is included in closed protection switch (V11) under the predetermined failure condition and the therefore short circuit step of alternating voltage side of turning round parallel operation device INU; it is characterized in that; this method further is included in after failure condition finishes, and turns round the alternating voltage side of parallel operation device INU with the step of the commutation of raising protection switch (V11) by at least a portion short circuit of using gate-controlled switch (V1 is to V6).
10. method as claimed in claim 9; it is characterized in that; under predetermined failure condition; at closed protection switch (V11) before; open a plurality of gate-controlled switches (V1 is to V6) of DC-to-AC converter among the converter apparatus INU, and keep gate-controlled switch (V1 is to V6) to open till failure condition finishes.
11., it is characterized in that after protection switch (V11) had commutated, this method comprised by opening current circuit under the converter apparatus so that the currentless step of converter apparatus INU as claim 9 or 10 described methods.
12. method as claimed in claim 11 is characterized in that, carries out opening of current circuit by the gate-controlled switch (V1 is to V6) of opening converter apparatus.
13. method as claimed in claim 11 is characterized in that, after protection switch (V11) commutation, the current circuit under the converter apparatus INU remains to be opened till can beginning modulation safely.
14. method as claimed in claim 13; it is characterized in that; converter apparatus INU is the converter apparatus of two feedback slip ring generator (1) rotor-side; and after protection switch (V11) commutation, the current circuit under the converter apparatus remains the electric current of opening up to generator (1) stator and drops to till the level corresponding to the magnetizing current of rotor.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20030525 | 2003-04-08 | ||
| FI20030525A FI20030525A0 (en) | 2003-04-08 | 2003-04-08 | The protection configuration of the rectifier means |
| FI20040034 | 2004-01-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1698253A CN1698253A (en) | 2005-11-16 |
| CN100394684C true CN100394684C (en) | 2008-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800003216A Expired - Lifetime CN100394684C (en) | 2003-04-08 | 2004-03-31 | Structure and method for protecting a converter device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100394684C (en) |
| FI (1) | FI20030525A0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104145390A (en) * | 2012-03-09 | 2014-11-12 | Abb技术有限公司 | Method for using an electrical unit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5788509B2 (en) * | 2010-07-27 | 2015-09-30 | アーベーベー・テヒノロギー・アーゲー | Converter system and method for operation of such a converter system |
| GB2483524B (en) * | 2011-01-27 | 2012-08-08 | Protean Electric Ltd | A switch arrangement |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2509924A1 (en) * | 1981-07-20 | 1983-01-21 | Loher Gmbh | ELECTRIC CIRCUIT SYSTEM FOR THE PROTECTION OF CONVERTER COMPONENT ELEMENTS AGAINST ELECTRIC OVERVOLTAGES |
| DE3129910A1 (en) * | 1981-07-25 | 1983-02-10 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for reducing the overvoltage stress of the thyristors and switches in a direct converter (cycloconverter) |
| US5687049A (en) * | 1996-01-26 | 1997-11-11 | International Rectifier Corporation | Method and circuit for protecting power circuits against short circuit and over current faults |
| US5734256A (en) * | 1995-05-31 | 1998-03-31 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| EP0969588A2 (en) * | 1998-06-29 | 2000-01-05 | Hitachi, Ltd. | Inverter apparatus |
| CN1354541A (en) * | 2000-10-06 | 2002-06-19 | Abb工业有限公司 | Current transformer system of current transformer component connected by D.C. intermediate loop and method for operating said system |
-
2003
- 2003-04-08 FI FI20030525A patent/FI20030525A0/en unknown
-
2004
- 2004-03-31 CN CNB2004800003216A patent/CN100394684C/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2509924A1 (en) * | 1981-07-20 | 1983-01-21 | Loher Gmbh | ELECTRIC CIRCUIT SYSTEM FOR THE PROTECTION OF CONVERTER COMPONENT ELEMENTS AGAINST ELECTRIC OVERVOLTAGES |
| DE3129910A1 (en) * | 1981-07-25 | 1983-02-10 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for reducing the overvoltage stress of the thyristors and switches in a direct converter (cycloconverter) |
| US5734256A (en) * | 1995-05-31 | 1998-03-31 | General Electric Company | Apparatus for protection of power-electronics in series compensating systems |
| US5687049A (en) * | 1996-01-26 | 1997-11-11 | International Rectifier Corporation | Method and circuit for protecting power circuits against short circuit and over current faults |
| EP0969588A2 (en) * | 1998-06-29 | 2000-01-05 | Hitachi, Ltd. | Inverter apparatus |
| CN1354541A (en) * | 2000-10-06 | 2002-06-19 | Abb工业有限公司 | Current transformer system of current transformer component connected by D.C. intermediate loop and method for operating said system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104145390A (en) * | 2012-03-09 | 2014-11-12 | Abb技术有限公司 | Method for using an electrical unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1698253A (en) | 2005-11-16 |
| FI20030525A0 (en) | 2003-04-08 |
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Effective date of registration: 20181026 Address after: Baden, Switzerland Patentee after: ABB Switzerland Co.,Ltd. Address before: Helsinki Patentee before: ABB A/S |
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Granted publication date: 20080611 |